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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc1b1db552e48cd669d1637c2dcc6a6cbf3867c04f1350bb1dc974e3acf67e6' 
  AND token = 'pyeVnJ2n25PCZmOAZEIffHTKiv4rR2EmaIeFybwVQuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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