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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12ac9bde480f4265f839aba5b99a6dc9255ebff8e07c2fccb6a9d8e16c9cf38' 
  AND token = 'oHO6ddUWkso35367jEqIVYLbdGwC1vV5AJF/G2JdfVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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