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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe2db442addb33ed39ee761b3eef7ea9db01d995aa0b0eb01b8fda33282efe8' 
  AND token = '7BG0RSQy6P4ry2MIxy66y57m8kSqB5GHMxgIKVT9We4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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