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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b122710de64cdba3b22c8a6e2fd08b3e57ec576be05c9e3d2d6ab98066520889' 
  AND token = 'sPpGUW82hpEuky2LFtAFny5LGRBqB/r1Zv63rftpAHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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