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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6ee2dcbcbe05c29cc4e0d3d18bc6a3c75785301c3d364ff563f3957110cf9b' 
  AND token = 'eOwPwDHTnTuinySXLZJfEJ9+JC407sB6UeQYb7eq2BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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