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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ebbcc58fa09dfda729468482c990dd24914bf3113936e0cd7c591a3e52b862' 
  AND token = 'siIGWUWv4ti8XDWNJ2t3X0FIx0/7jzNeGk38NLBk8ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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