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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58ddc20c43503a6caaff35845637957a7e2595f3c153b0308b2533c5ab477a0' 
  AND token = 'CTe55KdBAHxEMMmb76p0ErjB4Lauuxpq4HF/4xAZhPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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