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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bbb774b85d4cddd697008e2922a52f5d0b4ca2c2cfafaf4f82f85bb79c44b9' 
  AND token = 'dVqgs+cBjtT6BghNFScaCN4cwh3H8K38M8j0h3RajRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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