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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc30dbbf248e5365a3dd9ff543d38a0c45aa48d3b1c6697eddcc6a2dc217feae' 
  AND token = '76lpII+p5eJGcr/s/Uam/Vm7WyORnUTSgrB9qv0N/CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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