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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeac64309b08cb20925b179bdf9f664c3dd32504823c3277561a297ec03ff677' 
  AND token = 'tbQwEcft8jpG6/Nju+Uo5NdZonN8U8AUThOJD4b5GTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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