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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ab144afbf635aaf8cc2b4b9e8f31957c75711c55b1aa607ec8c16fe56032f1' 
  AND token = 'lEM1C5iePFPh64D3QOu+FyTisYcSKvj94LkJMqlGkNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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