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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c8ba6f4b6ea3959997d7fa338c8f4587596454f13a2c05c2cbf4fc598d8e2f' 
  AND token = 'EJrEFDmZNDX980YnANcECCxX7SiO6/sUjsoLSgdVBXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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