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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4973ec3d0fbc0712fa4dcbba6db9decc3cf462cd4920fb8d65fa040f6dc0913b' 
  AND token = 'JjLBtg+oZ8uos4VO1T2Y5W6Bk9+bE2ARMz7jOqOhrj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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