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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd234be475c549e7559ef042f7f23ea5887ad4b32c47fde42a645e8f3376e92f' 
  AND token = 'bwDXsxuAVaHMMJcCpK72Z2JNByEKUEQp3jEn5CZQG30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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