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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b6197095b00436fe43f1e5cc54a18ff66411f677aab5d5bc596b9ce8430858' 
  AND token = 'egm7OHNlpDbO1AEcl5SJAUGcD9deWnyVu4kpTpzgH+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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