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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc480ab3f8431de40f66968281e2fccf0c65923767305c1a8f1d12c69dd8e3ef' 
  AND token = 'stp+1ZqRExe3cHljU3yrvk7eWBkamvcnIe4CsfNe0Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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