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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc364e90a4cb767801f699093e92c3d3ae53970d616ea98b7f1aa6d03b59d80' 
  AND token = 'BjMO0BiydGSu4kl654uKreZmkxl4wnqYkPwBtEvP6ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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