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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa901bb4315636d1f6f520b259663de896049bf8c6187a07e9ef4efd12c5e21f' 
  AND token = '+7oiQybAvhQRwfkvoW6cF3s2kMOUw/WxWHelG0LFo/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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