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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d6bb4b9643a24aceedde244f00c257320e7276f4765782cdf277e270681e6e' 
  AND token = '9J1INYKdyEzqxIUwp0RBw+JMMACfN1NJkPjL+cZj3jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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