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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac92d0b667e48e2ab48962c384c4be308c42ab510c95c218d5f79c6202d12770' 
  AND token = '6HlmKHgCHlLPJrHzmfeudjA+6bWrrkaMw4ok19wUo6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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