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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb30d512b1729f0af24791a5d27d9a5fcaf0778eb4c75ae28ec174c3279bdcab' 
  AND token = 'caAhq6RVl1xRooVWTTVOBLBzQaUe0lDtM66j+3W0i5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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