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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06b8300ac8831589230f20165e3d4d7945d5ca75017dd431ffb2701bbf58fa0' 
  AND token = 'YOWxAksY4icEhGZTMVko9zaK6GETunn/EVNIG3eB7qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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