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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4da39e56dc8ae3053688e369bbdaaf42e885a15f96b38a04fc2b7fec723d61a' 
  AND token = 'Yde8RYQZ/MTqmpRR08IB8K/dUsESElAa+JdUBtphPbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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