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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0b8c00c3e91e6727dbeda30113bf0c57b155bf585808829a7c86438131b65f' 
  AND token = 'Mmmb+SYtBGY++c1qutg6hRYr8qJqWwwBI9tmeY2Bt6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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