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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff102d2ba12e7361517b815e51b0af2459129c77ca798856ff2e26adb3ccc14' 
  AND token = 'hq/2XNiNkW8Q2rQDMGtD7IpZ9gIDjt1YMzBXHQ4i31c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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