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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6cded28ee2f574151f68a1a0294ff2278140ca44f181079def705cd29b092c' 
  AND token = 'JLIi+nTTVlPgnk/abq0q2i0Ef7YZQ0GaBisMx/m104E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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