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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c4b584d01615830057390afb1e40f0a8aaa14958964d5f778d65e09b3aa8bd' 
  AND token = 'M2RKMToLsKSq+h/q2Sncn5HBLQ6XhAYPa8GwLA8Gutc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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