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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39958062cce5e7ed3c7933bdd418e3089b699444130558108d39d43eb73b839' 
  AND token = 'OL4EorGA34iriuSHecNyvkIeTV5A/MIHMOpFifDXXYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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