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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3d91e63aaa3f24f39a0456be9b82397ab516a93bde3c5b9977eb0735c0cd5a' 
  AND token = 'k1r8FmFwT/uVRKguqOylirVN2txChSxWw7zasDkUS6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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