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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f7f17daaad913428d5004955f34b133f8d5efe9d799a6e35976580944af15c' 
  AND token = 'wKCw+6DYzQOriGlfslr+Lk4MYnvHz07WR4fkeEdJXB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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