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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fa53ff523a50b30744e8134f6800d95897dddbf9235f592f82ab0f3b9cea84' 
  AND token = '7ALNNECWoqVFJ0YMptXGnADYvhjRYo5TT2BJYK7Gnds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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