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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc2565940a420968c3628515889283b8c8b7bc9d6d23e6b6bde9204ddec2960' 
  AND token = 'olPbfjRjAo7HeNpguquXJ/S0pB6GdHalyFeXIRspBHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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