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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acd5e15a09281136414ad7cc959bfdfe8466fc289e1c78dd9ef316371b48f79' 
  AND token = '8iQ1DhdgMAduy6j7C+EXJySOIBPnC++nd84K/6s9uJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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