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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa142a3895441039690f4564162a9a6a5196e85a61f9af1454f5e6f8bc32f8ab' 
  AND token = 'shN0wwWpEWzvII09cPQ3xk7MhKr9P/nmzkOdV90hqZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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