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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6024b69f972a3dbf5e25572dc4d3dee907bac72668355457217f386d7dda91' 
  AND token = '41u85G10MJqhh582V0ttWlVERsq2P1eie6H6m/Kz1vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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