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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bd58cad9b7ef1a172618589f12e7a7033758eb314c2476fbf0351e91466fa0' 
  AND token = '9sJOqgda17TcIL+2jQ/oknk6cDOc2v46upjt9cSFYU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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