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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c34581fbd60cd6e95a4f9b557514a3301b796efa96a6dab1c3d3f5f60a68f91' 
  AND token = '9ECh7oIj3AuEeFBnQiB+tw00mg+CJ1pj+X8JW5R/x38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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