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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e356d3e5ac57c38ef558d3ee8703426068d0ec45f79fa5547e87748911fbf5' 
  AND token = 'q4f1JkFCPX6+GlTZnE8BT93Lp+HYwr2rnMGDMgZuq7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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