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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacfa2549f5ebb64aff84e72f203658edff6afa1a9aa4aa392b6bd3c96dbc884' 
  AND token = 'ujokzQmxRJElpWVxK3sszjbmi+cydfC9lv578A6+6SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}