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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070ecea4c03b84a4c3b07807b89ea6fb91f66e2db599b885fdaa1086226552cb' 
  AND token = '4lisrRskFRrqX2JnwPRDjXOVrOj2V4LA1nu69BBBnRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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