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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77516c85a19b3b00b97e0f4f2a22eca33f0139d5ecd73f10405c371ed1eee79' 
  AND token = 'yABIwUkclP6z1T/jYII8wG8B0CsWVvuhtFawaoKo868=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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