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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fb4d1509abd6d67b7118d31440917b24e10f422ce0610126d81dfafe4ad4cb' 
  AND token = 'g2Pr6MXkQzV8QeCenF89fe5lBmvYnrV4AqvulBJU32A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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