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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179d69bd3957007b124a34d7ffe407646c47c6d170aa8c741ff1b0bed4816803' 
  AND token = 'lGBM3U1Yq00D70rLVZeAdR4ghcM3rh9r+moL+jNxGE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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