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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034ea600386d5b13e0eda91f70f19c2aa1d93bb0c1b779ba96ffd34c5543f12e' 
  AND token = 'PGg3RjLR3VehB0j85ItQoJfj2LUHDyZZTJy7GM/GfnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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