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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a2732b98152d457f2374c81e4238c099ce9d5b9b0c0a92889cd911b6b4f338' 
  AND token = 'WTJtINZ8GrA7p/K9EBQGqArDnf7ORmiCcr1I/8O7p5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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