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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418249330122b01b362fe8363e7c89bdc2c307c6557d1b13f3605b0048c04434' 
  AND token = '07pYGAxVQb13GjwxHFE7PXoamEqIU7HijVATgR7iQmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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