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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17017e32ec9322aae1cdf52585939279fd6316a28dfa06a71c97dad7e3fd318' 
  AND token = 'LtdwxbnBNKCLxNe09gSZYI4e52OlubvZAATq4wN5sP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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