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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b303e374fae6689adafd4a7a0854c911258eb2989e1ca7fd28348a5e0a48b7' 
  AND token = 'Fy0Iy+JHQXWj4kvbrxyL0+pkNFYqnryxV4E+eD2ctLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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