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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a8fe5feaa77f9ee4a9c39000c6ad960952f56f1e6a3d845a03f4176cd49aeb' 
  AND token = 'iur2JbDO4evp8fwjgkJCKkNv9fJNngGY+CkIjwyNjag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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