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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7055f67ffb002ffe037d7eba1b960d0561ce67729b3bd9053eb7c3a7e1b74a' 
  AND token = 'UVan+KsM1LT53xn3kOQjB1PaOKIn9FCZaOhwnAPEL3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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