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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aab507e1c602262cdb1d5525ceaf58753114db51c4dba030f45446b9e15eccc' 
  AND token = 'R2E3j02vnd2z0HI3vybrE2qr539iU9RMMN8Ds9nFP1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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