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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1160c5ac55483fa7a8bced09b145063144fe5fd2e7e64b865906d5fe5a41820' 
  AND token = 'drFbauzhWdh13rei6l3cmvV4RKr08Y2BdBsrEznkVm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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