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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01b0176d3b5c31e183f91e3b1a2a76530b7c53b7402cdc969e5afd56585ca4b' 
  AND token = 'i9BXgQ9SVWrOikivGU2AUSgCYYeRyh6p4J0w3/8P3wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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