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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b915e8a71d0b849e12f5009e2aed45189d6721ce6f96c3a72d0d80f49c45cd2' 
  AND token = 'SixEHaw9qA+1MktY6N3Te1Oj+5U0EMHY71ZEm6h4KYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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