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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76f95f8cb2d3eff57262ed2b7d703f43d969cd34ef71347ff90990baa0811cc' 
  AND token = 'rf1LN8ZqidxIg4+AastD3qbHU/xl9z/xru+llyWsGog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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