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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9697c0e1a21d9d6931cc015d33ca46e183052fa7b1b11e7d8d75aa7bba947c' 
  AND token = 'uf2jAjJiyyplLpY6jxGwnLC9EYx61UwkERHrkV3IieY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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