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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9abc952bcd2cc9130cbc9e9124eaf775ad22f2d52d2678d4ff33671b48d50e' 
  AND token = 'nJiLba+cXXiACtg28mtlep9kepT75xr6RzrWVSc8Xu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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