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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b964be61b371aa4e67582d7596cb999a7460727f2d5eb765e42001e3496e7e' 
  AND token = '+fgrqrhUp6WPEUis/38PQ6YMeaz23iHlWCs83eSG6mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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