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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bdf05116d2df1c40abd08b3c1db5b39dab7ae1936456ae22c6f097b10a57fc' 
  AND token = 'MwjkgPl+r0vLm9KM9r9F8vVoIfzBHv+pi6Iy7I4O52s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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