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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0003d0e845b86b7949afe1b4d1a9ea86d34580e1bf0b247be316c38a96582f89' 
  AND token = '3PTS/DIENmJ7eyEC0nRX4fGXJAgIUTdaOzl0HeVcLP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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