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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f58fef0c9bc57ae3d07ce55e6950e538a59001ba808cf4d3a98b66d23b70e1a' 
  AND token = 'oXOfrLe9trjgG06zel3nRi3fjnT/M2YNRJy1kmCqf7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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