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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4a834609fdb091f37a35eae00e0575b99e6f2a8830aa4d1c7c8f53868a3f9e' 
  AND token = 'DRUBnudPbCG73Qps8FPu0I5uOklhIhG/weBG03WOvMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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