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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1bddc0d997306e0199ddda53877f81656286cb6a90885461f84f86199e6d38' 
  AND token = 'cwSaazc9qmUBUIFYsr9vpDg0xtOQPeVnXsw+/95wa9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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