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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a84bc8af6f46fdb936e66d21f8091842c0252ce56ae0cf05a294405b4ba82c' 
  AND token = 'OUBelOUuTHPkagbwnxAXSlygDxW+bqesOsY5qFLvpT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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