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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a135663b1a492da6ddccf8bf607ffdf6ba42fb6ee141639fcdeca5b02328255d' 
  AND token = 'w2QKsK9k/L9R748YQjOVW0tr5A8ydRkyIRCsyIRJcRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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