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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0132c4fcd72cd7c09340c89fbe23817950e6c522ca561b85500bf281185ef25' 
  AND token = '0AnvgQlZ9DvPh5KzcYI7faedV5+asxczbLC4Vs2iWO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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