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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb050ffa33b5791adc38e2ed587b5ed7982156c70661e65a1ebf24949e9b94d0' 
  AND token = 'Hix5cLM5R5InLtz3YZ1fB5rE84nW/pXXT7YyX6DtefU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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