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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713449e7552297f4428bd4b0be818839a526c6f919cf9e98351f60cddb254b58' 
  AND token = 'jW17l6+PM75G3QPgaI4aD4O5hfeWzVhJL9oz4ZEsllQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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