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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9082bf1a48e30c5ed03bea472fc375d50344d7196596b00c6a294cae2ab4b263' 
  AND token = 'cHs2VGvcdc63B+ePEcsrammmD3PrQVF3jN6klDyzGL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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