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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4337291f15ee3435898dcc34fe727ba05382dd2efb8fb540b30ceb4e8cae41a2' 
  AND token = 'nImm15wbm+2S+AJe8zX060DhTVRsyLORFXQVUkI8Dwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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